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High Protein is Harmful

Myth #1: "High protein intake is harmful to your kidneys."

The origin: Back in 1983, researchers first discovered that eating more protein increases
your "glomerular filtration rate," or GFR. Think of GFR as the amount
of blood your kidneys are filtering per minute. From this finding, many
scientists made the leap that a higher GFR places your kidneys under
greater stress.

What science really shows:
Nearly 2 decades ago, Dutch researchers found that while a protein-rich
meal did boost GFR, it didn't have an adverse effect on overall kidney
function. In fact, there's zero published research showing that downing
hefty amounts of protein—specifically, up to 1.27 grams per pound of
body weight a day—damages healthy kidneys.

The bottom line:
As a rule of thumb, shoot to eat your target body weight in grams of
protein daily. For example, if you're a chubby 200 pounds and want to
be a lean 180, then have 180 grams of protein a day. Likewise if you're
a skinny 150 pounds but want to be a muscular 180.